Kilotest: Diagnoses of heading level skipped violation by HTML element 453 on Mozilla Foundation join us page

Basics

About the page

• URL: https://www.mozillafoundation.org/en/join-us/
• Tested 3 days ago on 2026-10-07 at 21:54 by job 261007T2132-l0b
• Summary of results:
  • Rule engines:
    • Called: 12
    • Were able to test: 12
    • Reported any rule violations: 11
  • Violations: 1762
  • Violators: 211
  • Issues: 46
• Download the full technical report (JSON)

About the issue

• Why it matters: Helper misdescribes the page
• Priority: low
• Related WCAG standard: 1.3.1
• Reported by 4 rule engines (Alfa + Axe + Html Checker + Pour)
• Violations: 4
• Violators: 3

About the violator

• Tag name: DIV
• Text: Thank you! … If you haven’t previously confirmed your opt-in to a Mozilla Foundation-related email subscription you may have to do so now. Please check your inbox or spam filter for an email from us to click and confirm your subscription.
• Start tag: <div class="newsletter-signup__success-content">
• XPath: /html/body/div[3]/div[1]/div[1]/div[2]/div[3]/div[1]/div[1]/div[1]/div[1]/div[1]/div[2]/div[1]
• Bounding box: [not obtained]
• Reported by Alfa

Diagnoses

Here is how rule engines diagnose the heading level skipped issue for HTML element 453 of the Mozilla Foundation join us page.

1. The heading skips one or more levels

   Rule engine: Alfa (Siteimprove)

   Rule: r53